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Mr Hall replied: "I would not, that's not true. I was suspicious because I thought she was trying to cover something up."

Miss Midgley suggested that, after Wilson stopped taking the contraceptive pill, they did not use any other contraception.

Mr Hall said it would be "incredibly unlikely" that he was the father of the child, but added: "We were still having sex every few months. We could have had intercourse around the time of the school trip."

Miss Midgley asked: "She was saying to you 'What would happen if I got pregnant?' and you said 'You will find yourself at the bottom of the stairs, that's not happening' and made references to a coat hanger."

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"I don't know why she thought that would alleviate (sic) me because it just made me more suspicious."

The court has heard that, when Wilson was first asked in September 2015 by the headteacher about allegations of an inappropriate relationship with a student, she denied it.

It was only months later, when Wilson told a colleague that another pupil was attempting to blackmail her into sex, that the school launched an investigation and she was suspended.

Mr Hall described going to the school with Wilson to talk to the head about the blackmail.

"I would say she was disgusted and upset and I was as well. I was very supportive of her."

He said Wilson did not tell him about the allegations of the inappropriate relationship and he only found out when he saw news reports of proceedings brought by the National College for Teaching and Leadership.

Mr Hall said he contacted her and added: "I was concerned primarily for what she might do. I was concerned for her personal welfare.

Eleanor Wilson

"She did respond and suggested it had all been blown up by the media. It did upset me because she had been dishonest with me on more than one occasion."

Wilson, of The Rope Walk, Dursley, Gloucestershire, denies four charges of sexual activity with a child by a person in a position of trust.

The trial continues.

Earlier the trial heard evidence from a schoolfriend of the complainant who said he first heard of rumours during the school holidays about the boy and Wilson.

"To begin with I was told by another student. At that point it was more of a rumour.

"The rumour was (the boy) and Miss Wilson were in some kind of relationship or seeing each other outside of school and that it was sexual," he said.

He said that when he returned to the school he spoke to his friend about it privately.

"I asked him about what had been going on with him and Miss Wilson.

"He told me about over the summer period when they went on the school trip and told me about how him and Miss Wilson had time alone and on the aeroplane home they had gone into the toilets and had sex," he said.

"He seemed calm really."

The witness said his friend later told him that Wilson was pregnant with his child and that she would have an abortion.

"He was upset. The gist of it was due to the circumstances of the relationship he knew that it would not be a feasible thing to do," he said.

The boy also told the court the complainant had said he and Wilson had spent time together outside of school.

Miss Midgley asked: "Was it your understanding they had sex on other occasions apart from the plane and that is based on what he told you?"

The boy replied: "Correct."

A member of school staff told the jury how she had given Wilson a lift home from the hospital following the abortion.

"Andy came out of the house to give her a hug and they both went inside," she said.

"I was quite surprised to see him at home."

The witness said the complainant would call the defendant Ellie rather than Miss Wilson and on one occasion she described walking to her office when she heard the boy call her a "f****** c***".

"When I went into the office Ellie was shaking her head in disbelief and we couldn't really believe what came out of his mouth," she said.

In a written statement, a teacher described the defendant: "Ellie did have an immature side to her and I did think she did not have a lot of common sense and she could be a bit silly.

"I had concerns that Ellie could be over familiar with students and she definitely had her favourites."

The court also heard from the complainant's step-mother who thought it was "unusual" that Wilson gave the boy a lift home in her car and believed she was "putting herself at a professional risk".

The woman said she discussed the situation with the boy's father and considered speaking to Wilson about it.

She added: "We thought Ellie was being supportive but thought she was being silly and putting her career at risk by meeting up alone.

"From further conversations I had with (the boy) he believed there was a real prospect of a relationship with Eleanor Wilson despite the age gap and with hindsight I could see how inappropriate it was."

The boy's father described the interaction between Wilson and his son as "quite laid back".

"At the time I didn't think too much about it but now I think about it differently," he said.

The court also heard that a forensic analysis of the boy's mobile phone revealed that between August 4 2015 and March 18 2016 there 339 "contacts" between him and Wilson, whose number was saved as "Smurfette" in his contacts book.